.jpg)
.jpg)
.jpg)
5 Reviews
View Product Reviews40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm
| 20+ boards | 40+ boards | 50+ boards |
| £15.83ex. VAT | £15.67ex. VAT | £15.51ex. VAT |
Coverage required
Nationwide Delivery
Wed 6 Aug
- 1days
- 15hrs
- 57mins
- 0secs
Learn more
Pay in 3 interest-free payments
Split your purchase of £15.99 into 3 with no sign-up fees or late fees.
£5.33
today
£5.33
1 month
£5.33
2 months
How it works
- Choose PayPal at checkout to pay later with Pay in 3.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Pay in 3 is a form of credit, so carefully consider whether the purchase is affordable and how you will make the repayments. Be aware of the possible impact of using Pay in 3 and of missing payments, including making other borrowing more difficult or more expensive. Pay in 3 eligibility is subject to status and approval. 18+ UK residents only. Available for purchases of £30 to £2,000. Terms and conditions apply. PayPal Pay in 3 is a trading name of PayPal (Europe) S.à r.l. et Cie, S.C.A. 22-24 Boulevard Royal L-2449, Luxembourg.
Learn more
Buy now. Pay with Klarna at your own pace.
Get what you need for your next project, choose how you pay.
Pay in 30 days
£15.99
Pay in full
Klarna's Pay in 30 days is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
Pay over time
£5.33
Every 30 days
Pay in 3
£5.33
today
£5.33
in 30 days
£5.33
in 60 days
Klarna's Pay in 3 is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
How it works
- At checkout select Klarna.
- Choose your payment plan.
- Different payment plans may be shown depending on the purchase amount and credit score.
- Complete your checkout.
- The amount will be charged based on the payment plan you chose.
Learn more
Pay in 4 interest-free payments
Split your purchase of £15.99 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
£4.00
today
£4.00
second payment
£4.00
third payment
£4.00
fourth payment
How it works
- Choose Clearpay at checkout to pay later with Pay in 4.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Clearpay is unregulated credit. Use responsibly. 18+, T&Cs and late fees apply at clearpay.co.uk/en-GB
Clearpay lends you a fixed amount of credit so you can pay for your purchase over 4 instalments, due every 2 weeks. Ensure you can make repayments on time. You must be 18+ and a permanent UK resident (excl Channel Islands). Clearpay charges a £6 late fee for each late instalment and a further £6 if it’s still unpaid 7 days later. Late fees are capped at £6 for orders under £24 and the lower of £24 or 25% of the order value for orders over £24. Missed payments may affect your ability to use Clearpay in the future and your details may be passed onto a debt collection agency working on Clearpay’s behalf. Clearpay is credit that is not regulated by the Financial Conduct Authority. T&Cs and other eligibility criteria apply at clearpay.co.uk/terms
Product Overview
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, KW, IV, LA, LD, LL, NP, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £150 | £40 ex. VAT |
| Between £150 - £350 ex. VAT | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £15 ex. VAT |
| Between £100 - £200 ex. VAT | £10 ex. VAT |
| Over £200 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £7.50 ex. VAT |
| Over £100 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{home}} Use in floors, framed walls and pitched roofs
- {{grade}} Aluminium composite facing on both sides
- {{thermostat}} 0.022 W/mK thermal conductivity
- {{build}} Easy to handle and install
- {{public}} Zero Ozone Depletion Potential (ODP)
- {{verified_user}} BBA certified
Technical Specification
| Material Type: | PIR |
|---|---|
| Thickness: | 40mm |
| Width: | 1200mm |
| Length: | 2400mm |
| Sales Unit: | Board |
| Sales Unit Coverage: | 2.88m2 |
| Brand: | Celotex |
| Manufacturer's Reference: | TB4040 |
| Weight: | 4.06kg |
| Thermal Conductivity: | 0.022W/mK |
Technical Downloads
About 40mm Celotex
- TB4040 is a high-performance PIR insulation board designed to combat thermal bridging (TB) in walls, roofs, and floors.
- BBA-certified for reliability and compliance with UK Building Regulations.
- Ideal for both new-build and retrofit projects where minimising heat loss is essential.
- Delivers excellent thermal efficiency with a low thermal conductivity of 0.022 W/m·K.
- Low-emissivity foil-facing enhances performance by reflecting radiant heat within cavity air spaces.
- Lightweight yet rigid design simplifies handling, cutting, and installation.
- Manufactured with sustainability in mind, offering Zero Global Warming Potential (GWP) and Zero Ozone Depleting Potential (ODP).
Applications
Roofs
- Pitched Roof Insulation: Below Timber Rafters, Above Timber Rafters
Walls
- External Wall Insulation: Timber Frame Internal Linings, Masonry Cavity Internal Linings, Solid Masonry Internal Linings
- Partition Walls
Floors
- Ground Floor Insulation: Beam & Block (Perimeter Upstand), Concrete Slab (Perimeter Upstand), Suspended Timber Joists (Perimeter Upstand), Upgrading Existing Concrete Slab (Perimeter Upstand)
Benefits
- Excellent Thermal Performance - 0.022 W/m·K thermal conductivity reduces insulation thickness required to meet U-values.
- Moisture Resistant - Prevents water absorption, maintaining thermal efficiency.
- Environmentally Responsible - Zero GWP and ODP, supporting sustainable construction.
- Cost-Effective - Provides high performance at a competitive price.
- Non-Toxic - Safe to handle and install, with no harmful emissions.
- Low-Emissivity Foil Facings - Improves thermal insulation within cavity air spaces.
Certifications
- Spread of Flame: Euroclass E Reaction to Fire classification (BS EN 13501-1).
- Thermal Conductivity: 0.022 W/m·K (BS EN 12667).
- Compressive Strength: ≥140kPa (BS EN 826).
- BRE Green Guide Rating of A - Supports BREEAM sustainability assessments.
- BBA Certified - Independently assessed for performance and compliance.
Customer Reviews
good
great for insulating
kept the house warm
great insulation
This insulation was used to address thermal bridging I had through some beams in our roof. Great to reduce localised heat losses in our loft. Also very competitive price!
Leave a Review
Related Articles
How to Insulate Under Floorboards Without Removing
How To Install Celotex Insulation Boards
Celotex Floor Insulation Guide
